Dymola, whitespace and version control - tortoisesvn

Question

I opened a Modelica library in Dymola, changed one line, closed Dymola and clicked "Save all", now TortoiseSVN is showing several hundred changed files instead of just one file with the one line changed I intended to do. All these changes are either whitespace, or line breaks, introduced by Dymola it seems.
Of course I can now be careful to only commit the file I have changed (and revert the rest), but that makes committing more time-consuming and error-prone than it needs to be. Or I can just commit it all, but that makes it hard for my colleagues to review the change. Also, it feels like it is not deterministic, so a later commit might just revert parts back. I sometimes even revert all changes, then use a text editor to change just the one line. All this makes version control unnecessarily complicated.
When I look at the commits and diffs for e.g. the Modelica Standard library:
https://github.com/modelica/ModelicaStandardLibrary/commits/master
The diffs are nice and small and readable usually. Is there a trick to avoid the whitespace issue?
How I can I turn off all autoformatting by Dymola? Is there a technical reason to do it in the first place?

Answer 1

You can reduce (but not entirely prevent) this behavior as follows:
Increase the maximum line length, e.g. to 130
In the GUI: Options > Text Editor > Max line length
From the command line: Advanced.MaxLineLength=130
Let Dymola format your whole library one time
Open the text view of the top-level package
Mark everything with Ctrl+A
Auto-format with Ctrl+Shift+L or Right-Click > Auto-Format
Save everything with Ctrl+Shift+S
Now go through the changes. Most will be useful, but sometimes spaces are removed, which you usually like to keep (especially before import and extends statements. They are sometimes moved to the very left)
Commit the changes
From now on try to save individual models only, not packages
(When packages are saved, Dymola sometimes reformats the nested classes)

Answer 2

There are some things you can do to make pretty git commits for Modelica code:
Use a text editor instead of a graphical editor. You have absolute control of what you change.
Use a graphical editor that does not change whitespace. I'm not sure of other alternatives, but OpenModelica/OMEdit will preserve existing indentation as much as possible (it can also be used to minimize diffs from changes in other tools, but it works less and less well the more changes there are).
Use a formatter as a pre-commit hook (indenting all files according to some settings in the formatter; but then you can't manually change whitespace).
Hope someone on stackoverflow has more alternatives than this.